Located on the right of the interface, the content panels contain all the content you can include in your mapping shapes, whether it is built-in or external content.
Spoilers: I'm getting ahead a bit here, but know that the creativity in HeavyM is not limited to these panels! You'll see in other articles that once you've added your content from these panels, you can also add post-processing effects, kind of like filters, on top of everything.
The Group Effects panels
The 3 red icons on the right let you open the Group Effects panels. In these panel, you'll find effects, like geometric animations or transformations, that you can insert in your faces and customize with many parameters.
Effects can be activated with the switch above each tab and apply on all faces in the selected group. To learn more on how to use these, please follow up with this article on the subject.
To check out all the existing effects and see some examples, head out to this glossary.
The Sources bin
The other kind of content you can display in your shapes is multimedia content. The Sources Bin contains all the sources you add, which you can then link to players in order to display them wherever you want in each sequence. You can even organize them in playlists!
Note: you can extend this panel to have a view with 8 media thumbnails in a line (as opposed to 4 like in the screenshot above).